Utilization of common salt (sodium chloride) as a fertilizer of coconuts grown in chlorine deficient areas [Philippines]
1986
Magat, S.S. | Margate, R.Z. | Habana, J.A.
The influence of increasing rate of NaCl (common salt): 0, 0.88, 1.76, 3.52 and 7.04 kg/tree/yr corresponding to 0, 0.44, 0.88, 1.86 and 3.52 kg Cl/tree/yr, respectively, were tested on local tall 'Laguna' coconuts grown on the Cl-deficient Tugbok soil (Typic Tropudalfs). In general, NaCl application increases nut production, copra weight/nut and copra yield/tree, but not oil content (%). Nut production response to NaCl application was linear up to 1.76 kg/tree/yr, quadratic up to 3.52/tree/yr, with the optimum rate of 2.4 kg NaCl/tree/yr producing 128 nuts/tree/yr. Average copra weight/nut and copra yield/tree/yr were linearly increased with 0 to 7.04 kg NaCl/tree application. The most economic rate of 1.76 NaCl kg/tree/yr resulted in: 36.6% increase in nuts; 44.8% increase in copra/nut; 96.7% increase in copra/tree (24.0 kg copra/tree/yr) and a net income P54.35/tree/yr (at P3.00/kg copra, P2.00/kg NaCl), average over a 5-year period. Leaf-N (%) was positively related and the main determinant of nut production, while leaf-C1 (%) the one positively related and main determinant of copra per nut and copra yield.
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